SCSI Addressing Requirements

 

The following is recommended for the SCSI addressing setup of legacy libraries. This requires the operator to use the front panel on the library to modify these settings. Please refer to your library manufacturer’s manual for information on this subject.

 

Note: These requirements do NOT apply to those libraries configured with UDO, UDO2, Blue-ray, or 5.2 GB, or 9.1 GB storage drives.  The libraries configured with these drives support the "READ element status" command that identifies which drive belongs to which library.

 

Stand-alone Drives

 

There are no specific SCSI addressing requirements for standalone drives.

 

Library

 

Many of the legacy libraries will NOT operate using the device manufacturer’s default SCSI ID assignments. These libraries are not capable of reporting the SCSI ID of each specific drive element via the SCSI "READ element status" command. If your library does not support this feature, please follow the recommended addressing scheme shown below.

 

Below are examples of correct and incorrect addressing schemes. In general, library SCSI IDs must be lower than drive IDs, and the drive IDs must be in sequence.

 

Single library

 

Correct

 

image\ebx_-81093274.gif

 

 

Incorrect

 

image\ebx_-1814400248.gif

 

Two-library system

 

SCSI IDs must be in sequence.

 

Correct

 

image\ebx_1811884224.gif

 

 

Incorrect

 

image\ebx_-376008351.gif

Note: We recommend using "TARGET MODE" over "LUN" in the library setup whenever possible.